@ng-web-apis/midi/esm2022/utils/get-ports-stream.mjs

An Observable based library for the use of Web MIDI API with Angular

import { inject } from '@angular/core';
import { from, fromEvent, map, of, shareReplay, startWith, switchMap } from 'rxjs';
import { MIDI_ACCESS } from '../tokens/midi-access';
export function getPortsStream(ports) {
    return from(inject(MIDI_ACCESS).catch(() => null)).pipe(switchMap((access) => {
        const inputs = [];
        access?.[ports].forEach((input) => inputs.push(input));
        return access
            ? fromEvent(access, 'statechange').pipe(map(() => inputs), startWith(inputs))
            : of([]);
    }), 
    // eslint-disable-next-line rxjs/no-sharereplay
    shareReplay(1));
}
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